Filling machine for high viscosity materials



July 28, 1964 H. SCHUDT 3,142,257

FILLING MACHINE FOR HIGH VISCOSITY MATERIALS Filed May 21, 1962 2 Sheets-Sheet l l INVENTOR.

HANS SCHUDT ATTORNEY July 28, 1964 H. SCHUDT FILLING MACHINE FOR HIGH VISCOSITY MATERIALS Filed May 21, 1962 2 Sheets-Sheet 2 B 0 O m m I 00 A0 4% 1 f/W \m m 11H m m 43 x Z Z I A Wm A TTOR/VE Y United States Patent M 3,142,257 FILLING MACHINE FOR HIGH VISCOSITY MATERIALS Hans Schudt, Darmstadter Str. 64456, Sprendlingen, near Frankfurt am Main, Germany Filed May 21, 1962, Ser. No. 197,180 10 Claims. (Cl. 103-38) The invention herein disclosed relates to metering pumps.

Special objects of the invention are to provide a metering pump for high viscosity materials which will handle materials of irregular consistency and possibly containing solids and voids.

Particularly it is a purpose of the invention to obtain accuracy in measurement of the charges delivered by the pump.

A further special object is to effect more or less separation of the measured charges furnished by the pump.

Other important objects of the invention are to enable quick and accurate adjustment of the volume delivered by the pump and to provide a machine having all such desirable characteristics which will be of simple, practical construction and which can be readily cleaned and kept in proper working order.

The foregoing and other desirable objects are accomplished in this invention by a novel combination of rotating cylinder ported at one end to cooperate with supply and delivery ports in a relatively stationary head and containing a metering piston making a suction stroke when the port in the rotating cylinder is in register with the stationary supply port and a discharge stroke when the cylinder port is in register with the stationary delivery port.

Other important features of the invention relate to the operation and timing of the piston to take in a volume in excess of that desired to be delivered and returning the excess back to the supply source at or before the start of the discharge stroke, thus to fill in voids and insure delivery of a full predetermined charge.

A further important feature relates to the reversal of the piston at the end of the discharge stroke to withdraw an amount of the material to effect more or less of a separation of the charge then pumped from the charge next to follow.

Other important features are structural details for adjustment of the volume and ready separability of parts for cleaning purposes and the like.

ther desirable objects and novel features of the invention are set forth or will appear in the course of the following specification.

The drawing accompanying and forming part of the specification is illustrative of a present commercial embodiment of the invention. Structure however may be modified and changed as regards the immediate illustration, all within the true intent and scope of the invention as hereinafter defined and claimed.

FIG. 1 in the drawing is a broken longitudinal sectional view of one of the pumps taken on a substantially vertical plane.

FIG. 2 is a front end elevation of the pump.

FIG. 3 is a top plan view of the pump.

FIG. 4 is a cross sectional view of the right hand end portion of the pump.

FIG. 5 is an inside view of the relatively stationary supply and delivery head, as removed from the basic pump structure.

FIG. 6 is an elevation of the ported end of the cylinder.

FIG. 7 is a diagrammatic view of the cam mechanism for reciprocating and timing the metering piston.

In the several views the stationary pump housing Or 3,142,257 Patented July 28, 1964 frame is designated 1, forming a base and support for the rotatably mounted cylinder or rotor 2, operated by gear 3.

A piston rod 4 is mounted for reciprocation in the rotor structure. This rod has affixed to it a radially projecting lug 5 fixed thereto by a bolt 6, carrying on its projecting portion a roller 7 engageable with cams for elfecting reciprocation of the piston.

The piston rod is keyed to turn with the rotor by the radial projection 5 being slidingly engaged in a longitudinal guide slot 8 in the rotor.

A disk 9 secured to the inner end of the rotor provides a mounting for the metering cylinder which is detachably connected and keyed thereto by a drive pin 10, with piston 11 operating in said cylinder 12.

The cylinder 12 is shown as having an external flange or ring 13 forming an extension of the head 14 closing the end of the cylinder.

Cooperating with the cylinder head 14 is a stationary supply and delivery head 15 which, as shown in FIG. 5, has a segmental inlet port 16 in connection with a suction coup-ling 17 and an angularly offset segmental discharge port 18 in connection with a delivery coupling 19.

The stationary head 15 is shown as having an annular flange 20 surrounding the annular extension 13 thus to form an enclosure over the ported end of the cylinder.

To enable ready separation of the stationary supply head from the cylinder it is shown as secured in place by tie rods 21 screwed in the end of the housing and carrying a removable bridge piece 22 supporting a screw rod 23 adapted to apply pressure to the supply head through the medium of an elastic pad or cushion 24.

The screw spindle 23 is shown as operable by a handwheel 25.

The circumferentially displaced supply and delivery ports 16, 18 in the stationary head cooperate with a segmental port 26 of greater circumferential extent in the end head 14 of the cylinder, the arrow in FIG. 6 indicating the direction of rotation.

The radial edge 27 of the cylinder port is indicated in FIG. 6 as a cutting edge cooperating with the ports in the stationary head to cut the solid parts of material, thus to reduce them to size properly handled by the pump.

The cam mechanism for imparting reciprocating motion to the piston in rotation of the same with the rotating cylinder is shown as an external cam 28 mounted on the housing, about the rotor 2, inclined to eifect suction stroke of the piston until, as shown in the developed view, FIG. 7, the roll 7 reaches a guide piece 29 and enters the recess 29a.

This depression 29a with respect to the horizontal portion 29b of the cam part 29 determines the excess of the suction volume over the desired discharge volume for which the machine is adjusted.

This discharge volume is determined by the position of the guide roller 7 on the cam part 2% which is horizontal in the developed view, shown as the same height as the cam surface 291).

Furthermore the horizontal course of guide roller 7 on cam part 290 leaves the piston without axial movement while rotary movement of the rotor continues.

The dwell thus given the piston enables the continuing rotary movement of the cylinder to effect closure of the supply port 16 after first returning excess of the suction volume back into the supply port.

Thus, with the piston given a suction stroke sufiicient to create an excess over the volume desired to be discharged, the cylinder port 26 will be kept open to the supply port for a time sufficient to enable return of excess material to the supply source. Before the ejection stroke of the piston starts the supply port 16 is closed and the delivery port 18 is partly open.

The ejection stroke is effected by engagement of guide roller 7 with the reversely inclined cam 3t) up to the cam part 31, FIG. 7, that is to the position designated 270.

The cam parts 29c to 31, shown in FIG, 7, thus efiect the desired filling volume after closing voids in the material by forcing back the suction volume taken in excess of the desired measured charge.

The cam part 31 is shown in FIG. 7 as having a reversely inclined portion 31a acting through the guide roller 7 to cause the piston to draw back into the cylinder a small percentage of the material ejected. This backdrawing step is desirable when a long delivery line is connected at 19 so as to more or less separate the discharged material. In this way the flow is broken up into charges suitable for filling purposes, and drip is prevented.

The quantity which is drawn back does not change the precise metering of each discharge portion since it is taken back into the port of the rotary cylinder by the piston at or before commencement of the suction stroke.

The horizontal course of the guide roller adjoining the cam portion 31a, FIG. 7, to the end of travel from A to B eiiects a standstill of piston with continued rotation of the cylinder through an angle in which the filling opening 18 is closed and the supply port 16 is partially opened before suction movement of the piston commences.

Adjustment of the suction volume and thus desired delivery volume is effected in the illustration by having the induction cam part 28 connected with the cam part 29 which determines the excess and the delivery volume by a bracket 32 and with these two cam parts jointly adjustable through the medium of a screw spindle 33 having a shank 34 rotatable in a guide lug 35 and engaged in threaded lug 36 of bracket 32.

The threaded spindle 33, as shown in FIGS. 1 and 2, is rotatably supported in the housing 1 and has a handle 37 with a scale 38 for indicating cam adjustment or delivery volume.

In FIG. 7 the intake cam parts 23 and 29 are shown in the position of maximum suction volume, the lowest position of adjustment in this view. The guide roller 7 at A is at the upper end of cam 28. By rotating spindle 33 these cam parts 28, 29 can be shifted upward to reduce the volume drawn in. Then the guide roller will first engage a lower portion of cam 28 and have a longer horizontal travel at 29c and engage a higher portion of the ejection stroke cam 30.

By such adjustment the discharge stroke is reduced by exactly the same amount as that by which the volume drawnin is reduced.

In making such adjustments the excess of intake volume over delivery volume remains the same.

The supply head 15 is normally held in yielding free sliding engagement with the rotary cylinder 12. Pressure against this head may be released by handwheel 25, whereupon bridge piece 22, FIG. 2, may be rotated about the lower pull rod 21, the bridge having a side slot 21a to clear the upper pull rod, permitting this movement. An end slot 21b in the bridge piece permits the latter then to be withdrawn from the lower pull rod 21.

With the removal of the bridge 22 the supply head 15 may be separated from cylinder 12 and the latter may then, if desired, be removed over the piston 11, the notch and pin connection permitting the cylinder to be separated from the supporting head or flange 9.

Thus all parts which come into contact with the material to be filled are readily accessible and can easily be cleaned.

The piston 11, thus exposed, may be readily removed from the rod 4 by releasing the screw by which it is held in place on the end of the rod.

Volume control is effected by adjustment of only one of the piston reciprocating cams, in this case the induc- 4 tion cam 28, the discharge cam 30 being shown as fixedly mounted on the pump housing.

What is claimed is:

l. A metering pump comprising a cylinder mounted for rotation on its longitudinal axis,

said cylinder having a port at one end for entry and expulsion of material to be measured and pumped,

a piston rotatable in synchronism with said cylinder and reciprocable in suction and discharge strokes in said ported end of the cylinder,

a relatively stationary head enclosing said ported end of the cylinder and having angularly displaced supply and delivery ports sequentially cooperable with said port of the rotatably mounted cylinder,

means for rotating said cylinder to effect successive registration of the port in said cylinder with said supply and delivery ports of the stationary head, and

means for reciprocating said piston in the rotary movement of said cylinder timed to effect registration of the cylinder port with the supply port on the suction stroke of the piston and registration of the cylinder port with the delivery port on the discharge stroke of the piston, said cylinder port being angularly extended to simultaneously momentarily connect the supply port and delivery port in the stationary head to enable return of excess material to the supply port on completion of the suction stroke of the piston.

2. A metering pump comprising a cylinder mounted for rotation on its longitudinal axis,

said cylinder having a port at one end for entry and expulsion of material to be measured and pumped,

a piston rotatable in synchronism with said cylinder and reciprocable in suction and discharge strokes in said ported end of the cylinder,

at relatively stationary head enclosing said ported end of the cylinder and having angularly displaced supply and delivery ports sequentially cooperable with said port of the rotatably mounted cylinder,

means for rotating said cylinder to effect successive registration of the port in said cylinder with said supply and delivery ports of the stationary head,

means for reciprocating said piston in the rotary movement of said cylinder timed to elfect registration of the cylinder port with the supply port on the suction stroke of the piston and registration of the cylinder port with the delivery port on the discharge stroke of the piston,

said means for reciprocating the piston being arranged to impart to the piston a suction stroke of greater volume than the quantity desired to be measured and including means for starting the discharge stroke of the piston prior to closing of the supply port and before opening the delivery port whereby to return excess material taken in on the suction stroke back into said supply port, leaving a measured quantity of material in the cylinder to be delivered by continuance of the discharge stroke of the piston.

3. A metering pump comprising a cylinder mounted for rotation on its longitudinal axis,

said cylinder having a port at one end for entry and expulsion of material to be measured and pumped,

a piston rotatable in synchronism with said cylinder and reciprocable in suction and discharge strokes in said ported end of the cylinder,

a relatively stationary head enclosing said ported end of the cylinder and having angularly displaced supply and delivery ports sequentially cooperable with said port of the rotatably mounted cylinder,

means for rotating said cylinder to effect successive registration of the port in said cylinder with said supply and delivery ports of the stationary head, and

means for reciprocating said piston in the rotary movement of said cylinder timed to effect registration of the cylinder port with the supply port on the suction stroke of the piston and registration of the cylinder port with the delivery port on the discharge stroke of the piston.

said means for reciprocating the piston being arranged to keep the cylinder port open to the delivery port at the start of the suction stroke before opening the cylinder port to the supply port whereby to effect a separation in the flow of material discharged from the cylinder.

4. A metering pump comprising a cylinder mounted for rotation on its longitudinal axis,

said cylinder having a port at one end for entry and expulsion of material to be measured and pumped,

a piston rotatable in synchronism with said cylinder and reciprocable in suction and discharge strokes in said ported end of the cylinder,

a relatively stationary head enclosing said ported end of the cylinder and having angularly displaced supply and delivery ports sequentially cooperable with said port of the rotatably mounted cylinder,

means for rotating said cylinder to effect successive registration of the port in said cylinder with said supply and delivery ports of the stationary head,

means for reciprocating said piston in the rotary movemovement of said cylinder timed to effect registration of the cylinder port with the supply port on the suction stroke of the piston and registration of the cylinder port with the delivery port on the discharge stroke of the piston,

said means for reciprocating the piston being arranged to impart to the piston a suction stroke of greater volume than the quantity desired to be measured and including means for starting the discharge stroke of the piston prior to closing of the supply port and before opening the delivery port whereby to return excess material taken in on the suction stroke back into said supply port, leaving a measured quantity of material in the cylinder to be delivered by continuance of the discharge stroke of the piston, and further including means for keeping the cylinder port open to the delivery port at the start of the suction stroke before opening of the cylinder port to the supply port whereby to break the flow of material discharged from the cylinder.

5. A metering pump comprising a cylinder mounted for rotation on its longitudinal axis,

said cylinder having a port at one end for entry and expulsion of material to be measured and pumped,

a piston rotatable in synchronism with said cylinder and reciprocable in suction and discharge strokes in said ported end of the cylinder,

a relatively stationary head enclosing said ported end of the cylinder and having angularly displaced supply and delivery ports sequentially cooperable with said port of the rotatably mounted cylinder,

means for rotating said cylinder to eifect successive registration of the port in said cylinder with said supply and delivery ports of the stationary head,

means for reciprocating said piston in the rotary movement of said cylinder timed to effect registration of the cylinder port with the supply port on the suction stroke of the piston and registration of the cylinder port with the delivery port on the discharge stroke of the piston, including a stationary earn,

a radially projecting arm connected with said piston,

a longitudinally extending guide rotatable with the cylinder and slidingly engaged by said arm and a roll mounted on said radial arm and engaging said stationary earn.

6. The invention according to claim 5, with means for adjusting said cam to vary the stroke of the piston effected by said cam.

7. The invention according to claim 1, with a rotor journaled on the same axis as said cylinder,

said cylinder having a separable end connection with said rotor and said relatively stationary head having a separable end connection with said cylinder.

8. The invention according to claim 1, in which said means for rotating said cylinder includes a longitudinal guide connected with the cylinder,

a radially projecting arm connected with the piston and engaging said guide,

a cam roll on said projecting arm and a helical cam about said guide positioned for engage ment by said cam roll.

9. The invention according to claim 8, with means for effecting adjustment of said cam to control the effective stroke of said piston.

10. The invention according to claim 1, in which said means for effecting reciprocation of the piston comprises oppositely inclined stationary induction and discharge cams,

a cam roll connected with the piston and engageable with said cams and means for adjusting one of said cams in respect to the other cam.

References Cited in the file of this patent UNITED STATES PATENTS 1,362,315 Hunter Dec. 14, 1920 1,444,052 Babcock Feb. 6, 1923 1,568,170 LeBret Jan. 5, 1926 1,614,389 Rainer Ian. 11, 1927 1,936,169 LeBret et al Nov. 21, 1933 FOREIGN PATENTS 558,751 France May 3, 1923 588,785 Great Britain June 3, 1947 OTHER REFERENCES Ser. No. 417,719, Reichsfeld (A.P.C.), published May 11, 1943. 

1. A METERING PUMP COMPRISING A CYLINDER MOUNTED FOR ROTATION ON ITS LONGITUDINAL AXIS, SAID CYLINDER HAVING A PORT AT ONE END FOR ENTRY AND EXPULSION OF MATERIAL TO BE MEASURED AND PUMPED, A PISTON ROTATABLE IN SYNCHRONISM WITH SAID CYLINDER AND RECIPROCABLE IN SUCTION AND DISCHARGE STROKES IN SAID PORTED END OF THE CYLINDER, A RELATIVELY STATIONARY HEAD ENCLOSING SAID PORTED END OF THE CYLINDER AND HAVING ANGULARLY DISPLACED SUPPLY AND DELIVERY PORTS SEQUENTIALLY COOPERABLE WITH SAID PORT OF THE ROTATABLY MOUNTED CYLINDER, MEANS FOR ROTATING SAID CYLINDER TO EFFECT SUCCESSIVE REGISTRATION OF THE PORT IN SAID CYLINDER WITH SAID SUPPLY AND DELIVERY PORTS OF THE STATIONARY HEAD, AND MEANS FOR RECIPROCATING SAID PISTON IN THE ROTARY MOVEMENT OF SAID CYLINDER TIMED TO EFFECT REGISTRATION OF THE CYLINDER PORT WITH THE SUPPLY PORT ON THE SUCTION STROKE OF THE PISTON AND REGISTRATION OF THE CYLINDER PORT WITH THE DELIVERY PORT ON THE DISCHARGE STROKE OF THE PISTON, SAID CYLINDER PORT BEING ANGULARLY EXTENDED TO SIMULTANEOUSLY MOMENTARILY CONNECT THE SUPPLY PORT AND DELIVERY PORT IN THE STATIONARY HEAD TO ENABLE RETURN OF EXCESS MATERIAL TO THE SUPPLY PORT ON COMPLETION OF THE SUCTION STROKE OF THE PISTON. 